<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        a{
            color: black;
            text-decoration: none;
        }
        a:hover{
            color: orange;
            text-decoration: underline;
        }
        p{
            width: 20px;
            height: 30px;
            color: pink;
        }
        p:hover{
            width: 100px;
            height: 200px;
            background-color: hotpink;
        }
    </style>
</head>
<body>
    <a href="#">百度一下</a>
    <p>
        wow
    </p>
</body>
</html>